6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-02 19:24:25 +00:00
Code Issues Projects Releases Wiki Activity

For PR950:

Browse Source 
The long awaited CAST patch. This introduces 12 new instructions into LLVM
to replace the cast instruction. Corresponding changes throughout LLVM are
provided. This passes llvm-test, llvm/test, and SPEC CPUINT2000 with the
exception of 175.vpr which fails only on a slight floating point output
difference.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31931 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2006-11-27 01:05:10 +00:00
parent 5fed9b9044
commit 3da59db637
105 changed files with 6737 additions and 3700 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@ -627,10 +627,9 @@ static bool isTargetConstant(const SCEVHandle &V, const TargetLowering *TLI) {
if (SCEVUnknown *SU = dyn_cast<SCEVUnknown>(V))
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(SU->getValue()))
if (CE->getOpcode() == Instruction::Cast) {
if (CE->getOpcode() == Instruction::PtrToInt) {
Constant *Op0 = CE->getOperand(0);
if (isa<GlobalValue>(Op0) &&
TLI &&
if (isa<GlobalValue>(Op0) && TLI &&
TLI->isLegalAddressImmediate(cast<GlobalValue>(Op0)))
return true;
}
@ -899,7 +898,7 @@ unsigned LoopStrengthReduce::CheckForIVReuse(const SCEVHandle &Stride,
// FIXME: Only handle base == 0 for now.
// Only reuse previous IV if it would not require a type conversion.
if (isZero(II->Base) &&
II->Base->getType()->isLosslesslyConvertibleTo(Ty)) {
II->Base->getType()->canLosslesslyBitCastTo(Ty)) {
IV = *II;
return Scale;
}
@ -1044,9 +1043,10 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(const SCEVHandle &Stride,
if (!C ||
(!C->isNullValue() &&
!isTargetConstant(SCEVUnknown::get(CommonBaseV), TLI)))
// We want the common base emitted into the preheader!
CommonBaseV = new CastInst(CommonBaseV, CommonBaseV->getType(),
"commonbase", PreInsertPt);
// We want the common base emitted into the preheader! This is just
// using cast as a copy so BitCast (no-op cast) is appropriate
CommonBaseV = new BitCastInst(CommonBaseV, CommonBaseV->getType(),
"commonbase", PreInsertPt);
}
// We want to emit code for users inside the loop first. To do this, we
@ -1092,12 +1092,13 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(const SCEVHandle &Stride,
// If BaseV is a constant other than 0, make sure that it gets inserted into
// the preheader, instead of being forward substituted into the uses. We do
// this by forcing a noop cast to be inserted into the preheader in this
// case.
// this by forcing a BitCast (noop cast) to be inserted into the preheader
// in this case.
if (Constant *C = dyn_cast<Constant>(BaseV)) {
if (!C->isNullValue() && !isTargetConstant(Base, TLI)) {
// We want this constant emitted into the preheader!
BaseV = new CastInst(BaseV, BaseV->getType(), "preheaderinsert",
// We want this constant emitted into the preheader! This is just
// using cast as a copy so BitCast (no-op cast) is appropriate
BaseV = new BitCastInst(BaseV, BaseV->getType(), "preheaderinsert",
PreInsertPt);
}
}